标题： 结构弛豫与笼状动力学之间的尺度关系在Ca_{0.4}K_0.6(NO_{3})_{1.4}和甘油中的表现：自由体积、时间尺度及其对压力-能量相关性的意义 显示英文标题

标题： Scaling between structural relaxation and caged dynamics in Ca_{0.4}K_0.6(NO_{3})_{1.4} and glycerol: free volume, time scales and implications for the pressure-energy correlations

摘要： 慢结构弛豫与快速笼状动力学的缩放关系在熔盐 Ca_{0.4}K_{0.6}(NO_{3}\$)_{1.4} (CKN) 中得到了证实，该物质的结构弛豫时间跨越了约十三个数量级。 甘油的缩放行为被详细分析。 在甘油中，短时间均方位移 <u^2> 是衡量笼状动力学的指标，它由自由体积贡献。 可以看出，为了证明缩放关系，快速动力学的观测时间必须短于弛豫过程的时间尺度。 具有可忽略（如 CKN、甘油和网络玻璃形成体）和高（如范德华液体和聚合物）压力-能量相关性的系统都表现出慢弛豫与快速笼状动力学之间的缩放关系。 根据现有实验，缩放数据主曲线的等构不变表达式与更简单的非不变表达式无法区分。 相反，后者与一大类模型聚合物的模拟结果更为一致。 显示英文摘要

摘要： The scaling of the slow structural relaxation with the fast caged dynamics is evidenced in the molten salt Ca_{0.4}K_{0.6}(NO_{3}$)_{1.4} (CKN) over about thirteen decades of the structural relaxation time. Glycerol caling was analyzed in detail. In glycerol, the short-time mean-square displacement <u^2>, a measure of the caged dynamics, is contributed by free-volume. It is seen that, in order to evidence the scaling, the observation time of the fast dynamics must be shorter than the time scales of the relaxation processes. Systems with both negligible (like CKN, glycerol and network glassformers) and high (like van der Waals liquids and polymers) pressure-energy correlations exhibit the scaling between the slow relaxation and the fast caged dynamics. According to the available experiments, an isomorph-invariant expression of the master curve of the scaled data is not distinguishable from a simpler not-invariant expression. Instead, the latter grees better with the simulations on a wide class of model polymers.